HTTP Post example in JavaScript - https://medium.com/douglas-matoso-english/http-primer-for-frontend-developers-f091a2070637

http-post.js

// the request:
// POST a new email address to my GitHub account
fetch('https://api.github.com/user/emails', { // the URI
  method: 'POST', // the method
  body: JSON.stringify(["[email protected]"]) // the body
})
  .then(response => {
    // we received the response and print the status code
    console.log(response.status)
    // return response body as JSON
    return response.json()
  })
  .then(json => {
    // print the JSON
    console.log(json)
  })

// on success will log:
// 201
// { ... contents of the response body as JSON ... }